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XS(XS_REGTEST_rcv_msg)
{
...
    XSRETURN(1);
}

void
GetBorders(handle)
...
    else {
        XSRETURN_UNDEF;
    }

void
tdxs_wait_for_response()
...
        PUSHs(&PL_sv_undef);
        XSRETURN(3);